An adjustable magnetic trip unit and a circuit breaker...

Details An adjustable magnetic trip unit and a circuit breaker... An adjustable magnetic trip unit and a circuit breaker...

H - Electricity

01

H

H01H 71/32 (2006.01) H01H 71/24 (2006.01) H01H 71/74 (2006.01) H02H 3/02 (2006.01) H02H 3/08 (2006.01)

Patent

CA 2495605

The magnetic trip device of a circuit breaker has a magnetic pole in which a magnetic field is generated by load current, and an armature assembly that includes: a bracket supported for pivotal movement relative to the magnetic pole; a spring biasing the bracket to a position spaced from the magnetic pole; an armature hinged on the bracket; and an adjusting screw for adjusting a gap between the armature and the magnetic pole for calibrating the trip device without affecting the spring bias, which can be separately and independently adjusted to select the load current at which the magnetic trip is initiated.

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